Straight talk Galaxy S II

My Galaxy S II still has Gingerbread on it and I want to update to ICS or Jelly Bean (preferably Jelly Bean). I installed Kies today and it says that my phone is not supported by the Kies program. Any suggestions on how to update my phone are greatly appreciated

mine and my wife's S2 HAVE been updated to jelly bean by Samsung............................................what a pile of rubbish!! Seriously, not sure what they are doing but up til the point of update, i sang the praises of my S2, reliable and easy to use, afraid neither are that anymore. Constant crashing, HUGE power usage, hi power battery not lasting a day, corrupt apps, ones that did work, no longer do, and everything is soooooo sloowwwwwww. Both phones are having big issues, not happy